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Commit 04bfdd84 authored by Joerg Roedel's avatar Joerg Roedel
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x86/amd-iommu: Flush domains if address space size was increased 



Thist patch introduces the update_domain function which
propagates the larger address space of a protection domain
to the device table and flushes all relevant DTEs and the
domain TLB.

Signed-off-by: default avatarJoerg Roedel <joerg.roedel@amd.com>
parent 407d733e

arch/x86/include/asm/amd_iommu_types.h

+1 −0
Original line number Diff line number Diff line
@@ -235,6 +235,7 @@ struct protection_domain { 
	int mode;		/* paging mode (0-6 levels) */

	u64 *pt_root;		/* page table root pointer */

	unsigned long flags;	/* flags to find out type of domain */

	bool updated;		/* complete domain flush required */

	unsigned dev_cnt;	/* devices assigned to this domain */

	void *priv;		/* private data */

};

arch/x86/kernel/amd_iommu.c

+32 −0
Original line number Diff line number Diff line
@@ -63,6 +63,7 @@ static void dma_ops_reserve_addresses(struct dma_ops_domain *dom, 
				      unsigned int pages);

static u64 *fetch_pte(struct protection_domain *domain,

		      unsigned long address);

static void update_domain(struct protection_domain *domain);



#ifndef BUS_NOTIFY_UNBOUND_DRIVER

#define BUS_NOTIFY_UNBOUND_DRIVER 0x0005
@@ -546,6 +547,8 @@ static int iommu_map_page(struct protection_domain *dom, 


	*pte = __pte;



	update_domain(dom);



	return 0;

}
@@ -762,9 +765,13 @@ static int alloc_new_range(struct amd_iommu *iommu, 
		dma_ops_reserve_addresses(dma_dom, i << PAGE_SHIFT, 1);

	}



	update_domain(&dma_dom->domain);



	return 0;



out_free:

	update_domain(&dma_dom->domain);



	free_page((unsigned long)dma_dom->aperture[index]->bitmap);



	kfree(dma_dom->aperture[index]);
@@ -1294,6 +1301,29 @@ static int get_device_resources(struct device *dev, 
	return 1;

}



static void update_device_table(struct protection_domain *domain)

{

	int i;



	for (i = 0; i <= amd_iommu_last_bdf; ++i) {

		if (amd_iommu_pd_table[i] != domain)

			continue;

		set_dte_entry(i, domain);

	}

}



static void update_domain(struct protection_domain *domain)

{

	if (!domain->updated)

		return;



	update_device_table(domain);

	flush_devices_by_domain(domain);

	iommu_flush_domain(domain->id);



	domain->updated = false;

}



/*

 * If the pte_page is not yet allocated this function is called

 */
@@ -1351,6 +1381,8 @@ static u64* dma_ops_get_pte(struct dma_ops_domain *dom, 
	} else

		pte += IOMMU_PTE_L0_INDEX(address);



	update_domain(&dom->domain);



	return pte;

}